Automatic weighing-scale.



I .and- Dominionof Canada, have invented' -'certain new and' useful Improvements in; 'Automatic `Weighing- Scales, of. which; the

i jectis to. provide means Whereby'the scale PATENT QFFICE.

. ,AVILA GAUvIN, o'F MONTREAL, QUBEC, CANADA..

' 4 An'roizrA'ric WEIGHING-scALE.

, Specification o f Letters Patent.

- Patented Aug. l1, 1911.

- Application medvrebruary 14, 1910. serial No. 543,841.

i To all-whom it'fmay concern; Be it known that I, AVILA GAUVIN, of the city ot Montreal, in the Province ot' Quebec `following 4is a full, clear, and exact'descrip'- tion. 1

Thisinvention relates to improvements inautomatic Weighing scales, andthe main. ob#

.will come quickly to balance without the necessity of shift-'in'gthe counterpoise.

. A further object is to provide a weight indicating mechanism for 'the scale 4which .cannot be tampered Vith.`

. A still further object is to provide lmeans whereby 'the scale maybe adjusted for more accurately weighing small weights.

To accomplish these fobjects, I provide .a framewcrk carrying a suitably! larranged l' depressibleplatform connected to a pivoted' beam, which is in turnconn'ected to one of two leversv carrying the counterpoise.

An adjusting 'device is provided vwhereby the other'ma "be made to Vcarry more or less of the weig tof the counterpois'e -so vas to make the scale more or -less sensitive. A curved. glass tube-l having a bubble therein, passing under a suitablyv graduated scal'e,kir1dicates the weight on the platform. f g Int-he 'drawings hich 'llustrate-my in- Ventionz-Figure 1 'isa front elevation o f Ithe device. Fig. -2 .is a sideelevation.V Fig.-

3 is a plan vie-w of the-platform lever. Fig; is al 4View of a portion of the 'weightindl-f ,eating scale.

In the above defined figures, 5 'designates asuitab'ly shaped base, and 6 the inclosing.

case of the weighing mechanisml'which is supported ven the base-by a pair of hollow 'legs 7. 'A'yol're'S vis fixed to the-frontend of fthe base Aandfpivotally supports thev plata;

formleverv 9 at the bearings 10. VThis lever,

weight 12 is provided mountedon- 9v is provided .withan'larm 15 extending at fair angle 'thereto'.f and enteringjone legs 7 througlr'a' s'lotrl therein.' A- platform support 17 is' pivotalljr `supported lon of which ispivoted to the base.

etively, the block 3 3 being fixed 'on the rod the lplatform lever 9 a bearing18 located to the'rearot` the bearings' 10,' This platform support is maintained horizontal 'by means" of a 'central post 19k depending -thereiromA and' passing through an .a rture-201'i11 vthe base 5. The lowerrend o thepost'ispiv.-

son

oted to one end o f 'a link 21, the oppvtgp I'.

porti? may be fiat, asshown, and. adapted to support a platform 22,'or may bel curved to support a scoop-pan,- such as is used by. grocers.

A.A 'framework-'23 is located diametrically across the case -6, and'is raisedat its center 24 .where the beam 25 is s upportedon abea# ing 26.' Pivoted to the framework 23 at each side ofthe raised portion'24 are depending levers 27 and 28,l the former of which, 27, isconnected to l.the beam by a.

link 29which is pivotally mounted atieach` end. The counterpoise is in the forni ,of a

tube' 30, preferably of glass, containing some suitable liquid; The tube 30 is mountedfbe- -tween caps. 31 which are connected by a' smal/l rod. 32. A pair of blocks 33 and 34 i' are/mounted on this rod 32 and pivotally. connected to the vlevers -2"( and' 28, respec- Y andthe block 3ft being longitudinally adscrew 35.- YAt the-ends of the 'beam 25 are .caps 36 and 37, somewhat similar to the caps Y334 and 34,"Which' support between them a curved glassl tube 38 and a curvedscale 39 above the tube. 4The tube 38 contains a suitable liquidin which "a' small bubble-4 0 is' left, such `'asis seen in a 'spirit level, and this' justable thereon :by means of' a small set 'bubble moving in -the` tube, as thev beam tilts,-

indicates `Weights on .the scale 39. The' cap .36 is preferably hinged to the beam. while the. cap 37 is mounted on the beam by means "of a-set screw 41,.so -that the tube 38 may be -readily adjusted t0 the beam.' The-op'- -1 'posite' arm of the beam from the link 29 is 10Q connectedto the arm '15 of the vplatform le- -verfby a rod 42, which'passes down through one' ofthe hollow legs'.. AThe front and back of the case` are orn'ied of, thick glass' plates 43, which efeetually .protect the mechanism and' through which the same may be readily .seen by both customer land indicating de'ViceA/ifmay b'e mounted above fvender.l Anysu'itable cost computing and the-case and operated by a rod 45. pivot- 1'19 all-y connected' to" the opposite end of the support a weight 47.

capacity of the scale, I provide on one side of the plat-form lever 9 a bar 46 adapted to Wherever possible throughout the device, I vprefer to usethe well known knife edge in all bearings, as

this bearing reduces friction to a minimum. Wherever practicable, these'bearings are in the v'form of a small block 48 of polished nia'rble, or other suitable material, attached .wie

Y'to the metal parts .of the scale by screws 49.

The bl'ocks 48 are preferably provided with .a wideshallow groove for "the reception of the knife edge 50, as shown in Fig. 2.

, When the Weight47. is placed on the front end of the bar 446, it tends to raise the tail of the lever 9, and thus compensates for any additional Weight over 'the capacity of the sca'lev'in the well' known: manner. The Iweight 47 may also be placed .very close tothe-pivotal point l and used as a tare weight whemgoods are weighed in containersqf, To `render the scale 'more sen'sitive sotha't small weights may be more -ac' curately gaged, toftlie fraction-of af'pound,

QI provide graduations l on the rod' 32, A[eaci indicating a limitof apacity for the Asca' e.y

Y Corresponding i with the ,graduations 51, I 4provide series of lgraduations 52 on the .scale 739, i/which .will divide the same length ofscale intoffwe'r. and therefore larger divisions forl each pound or fraction thereo 42. As the -beam 25 moves, it carries the the Vilbenthe device is thus adjusted to weigh" lever 27 with it by reason of the connecting link 29. As the counterpoise 30 .is raised on the end of the lever 27 it is also moved vto one side` so that, as it rises, more ofits weight depends from the beam 25 through the link 29. In this way the counterpoise 4is automatically adjusted to balance the weight on the platform. When the beam 25 tilts,lthe bubble 40 in the tube 38 seeks the highest point of the tube and indicates on the scale 39 the weight on the platform. "When it is desired to render the scale more sensitive, the block 34 is moved on the rod 32, toward thecenter of the counterpoise and. locked by the screw 35. As shown in Fig. 1, the weight of -the counterpoise is equally divided between' the levers 2,7 and 28 but if the block34`y isv shifted, say to Vgraduation 10, most of the weight of the counterpoise is paratively littleV force need be applied t o lever 27 to raise the counterpoise.

onlyA ten pounds, the graduations on the scale 39, dividing the same'into ten'parts, are used. As each division 1s larger, the

bubble 40 will indicato the weight more *ac-"l on the lever 28 so that commore sensitive. l

curately. A guard rail 53 'may be attached to the platform to protect the glass face of the case from breakage or soiling. l/Vlien it 1s desired to make the above described adjustinent permanent the u-pper end of the apertures 54 in the support 23. If the ca pacity requires still further'reduction the link 29 may be shifted nearer the center of the beam and pivoted in the apertures 55, the lower end of the link being necessaiily lever-28 may be shifted to one of the pivot shifted to corresponding apertures 56 1n the lever 27 The use of a liquid in the counterpoise' tube prevents the jars and vibrations that would be caused by a solid weight and allows the scalel to cometo a balance more rapidly.

Having thus described myinvention, what I claim is I l. In a, weighingvscale, azscale beam, a platform, means connecting the scale beam .and platform, a counterpoise, a pair of -levers suspending the counterpoise below the scale beam, vand a link connecting the scale beam and one of said levers.

V2.- In a weighing scale, a scale beam, a platform, means connecting `the scale beam and platform, tube, a liquid content, therefor, and a tube holder, a pair of levers suspending the counterpoise below the scale beam, anda link connecting the scale beam and one of said levers. v. 1

3. In a Aweighing scale, a scale beam, a platform, means connectingv the scale beam and platform, a counterpoise comprisin` a liquid containing tube and holdery therefor, means suspending the counterpoise below the scale beam, a link between the scale beam and said lsuspending means,a curved transparent tube superposed on the scale beam having a bubble therein, and a graduated scale above said tube. l

'4. In a weighing scale, a scale beam, platform, means connecting the scale beam and platform, a counterpoise comprising a tube, a liquid content therefor, and a tube holder, a pair of levers suspending the counterpoise below the scale beam, a link connecting the scale beam and one of said levers,

a curved transparent tube superposedon the scale beam containing a liquid having a small bubble therein, and a correspondingly curved graduated scale above said tube.

5. Ina weighing scale, a scale beam, a platform, means connecting the scale beam and platform,a counterpoise, comprising a tube, a'liquid content therefor, and a .tube holder, a'pair of levers suspending the counterpoise below the scalefbe'am, a link connecting thescale beam and one'of said levers, and means for adjusting the second of said levers on the tube holder to render the lscale holder, a pair of levers suspending theleoui- 'terpoise below the scale beam, a linkf'ic'on- -necting the scale beam and one of said levers,

Y ar curved transparent ,tube superposed on the mea'ns f for adjus scale beam` containing a having a 1 0. i i

smalll bubble therein, aff-'correspondingly curved graduate leabove said tube, and

the secondi of saidflevers onthe 'tube' 'older to render the sleale more sensitive.

7.l In a VWeighlng scale, a frame-work, a-

beam pivotally mounted therein',- a platsupported onthe framework, means erpoise comprising a.' tube, a liquid conecting the platform and scale beam, a A

tent-therefor, and a tube holder,a pair of .4

Vlevers "s'u'spending the oo unterp'oise below.' the 'scale beam, a'lnkc'onnecting one of said levers and the scale beam, means' for adjusting the other lever on the tube hol-der to regulate the capacity o f the scale,l a curved- `transparent Vtube super o sed on the scale beam, a liquid content or saidvcurved-tube having a sm'allbubble therein, a'eorrespond- .ingly curved graduated scale above the tube, and means for adjusting the' tube andseale to the scale beam;

- Inwitness whereof .I have hereuntoset'm'y hand in the presence of two Witnesses.

TA-VILA GAuviN.

Witnesses: STUART R. W. ALLEN, R. McKnNzrE; 

